1700 results about "Round bar" patented technology

The invention relates to the technical field of cables, and discloses a multi-layer composite wrapped high-temperature-resistant anti-aging cable which sequentially comprises a conductor, an insulating cable core, a shielding layer, an outer insulating layer, a fireproof layer, a heat insulation layer, a buffer cushion layer, an armor layer, an anti-aging layer and an outer sheath layer from inside to outside. The fireproof layer is formed by alternately laminating synthetic mica tapes and ceramic boron silicone rubber tapes, a reliable fireproof barrier is formed, and the heat insulation layer is arranged to achieve efficient heat insulation and stable structure through cooperation of gradient pore nano aerogel, ceramic silicone rubber round rods and phase change capsules. The buffering cushion layer is combined with the composite layer, the aluminum oxide hollow ball array and the composite capsule, so that the mechanical buffering and auxiliary heat insulation functions are achieved; the armor layer is woven by stainless steel fibers, the mechanical protection capability is improved, and the anti-aging layer is of a double-layer structure composed of montmorillonite composite fluororubber and an anti-oxidation layer, so that thermal oxidation aging is delayed.

The application belongs to the technical field of round bar bending and cutting device, in particular to a bending and cutting equipment for stainless steel round bar processing, which comprises a conveying and processing assembly, an upper resisting component, a bending assembly, a conveying limiting block and a base plate, an adjustable auxiliary assembly is installed on one side of the conveying limiting block, the adjustable auxiliary assembly comprises a fixed plate fixedly installed above the base plate and a movable plate movably installed above the base plate, the lower inclined plate pushes the movable resisting block through the driving of the telescopic piece, that is, the two movable resisting blocks position the round bar inside the movable resisting block through the arc-shaped blocks, the round bar and the workpiece connection are cut off as the cutting knife continues to descend along with the top plate, after the cutting work is completed, the telescopic piece is driven to make the top plate ascend, the movable plate moves away from the fixed plate to expand the distance between them, the movable polishing assembly is used to make the polishing structure enter the distance between the fixed plate and the movable plate, and the cut surface of the round bar and the workpiece is polished.

The invention relates to the technical field of material metallurgy, and discloses high-wear-resistance hot-rolled round steel for titanium-containing steel balls and a preparation method thereof.The round steel comprises 0.60%-0.67% of C, 1.40%-1.60% of Si, 0.70%-0.90% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.70%-0.90% of Cr, 0.10%-0.15% of Ti, smaller than or equal to 0.30% of Ni, smaller than or equal to 0.40% of Cu, smaller than or equal to 0.05% of Al, smaller than or equal to 0.0020% of O, smaller than or equal to 0.0002% of H and smaller than or equal to 0.0035% of N; and the balance of Fe and inevitable impurities. Through the high-titanium-low-nitrogen microalloying design, the technical contradiction that the toughness is remarkably reduced when the strength and the hardness of traditional high-carbon steel ball steel are improved is solved, and excellent synergistic improvement of the strength, the hardness and the toughness is achieved.

The disclosure relates to a segmented ball valve for low noise and anti-cavitation applications, wherein a replaceable cartridge may be fixed inside and retained by stem and end post. The cartridge may incorporate irregular or regular polygonal-shaped plates or a combination of polygonal shaped plates and round bars facilitating staged pressure reduction and effectively mitigating or eliminating the occurrence of high-intensity cavitation and noise. The segment may have a precisely machined cylindrical bore designed to accommodate a slide-fit anti-cavitation and noise reduction cartridge; this allows for convenient field replaceability of the cartridge with minimal effort, eliminating the need for welding or fasteners to affix it to the segment. This cartridge may also facilitate the utilization of this fully cylindrical bore inside the segment for incorporating a greater number of pressure reduction stages compared to the currently available designs.

The invention relates to the technical field of forge piece forming, in particular to a deep-cavity thin-wall support forge piece, a forging die and a forming method.The deep-cavity thin-wall support forge piece is characterized in that a heated round bar is subjected to roll forging to obtain a preformed blank, and oxide skin of the blank obtained after roll forging is removed; putting the prefabricated blank into a pre-forging cavity of a forming die, and performing pre-forging forming; after pre-forging is finished, the pre-forged piece is transferred into a precision forging cavity of the same forming die to be subjected to precision forging forming, and a bilaterally symmetrical precision forging piece is obtained; putting the bilaterally symmetrical precision forgings into a slicing die frame for trimming, and cutting off flashes; cutting the bilaterally symmetrical precision forgings subjected to cold shaping from the shunting bin through a cutting device, and separating the bilaterally symmetrical precision forgings into two independent single forgings; forming defects are eliminated, and the forging yield is improved to the level of stable mass production; the thickness tolerance of the functional surface of the product is ensured, the spot welding current stability and the welding strength are ensured, the assembly requirement is met, and the dependence on subsequent machining is reduced; the material cost is reduced and the mold life is prolonged.

The invention discloses a graphite round rod rotary cutting machining platform, and belongs to the technical field of graphite raw material machining. The graphite round rod rotary cutting machining platform comprises a workbench, a cutter adjusting assembly is arranged in the middle of the workbench, and a plurality of discharging ports are distributed in the workbench in the circumferential direction with the cutter adjusting assembly as the circle center; a plurality of first rotating assemblies corresponding to the discharging ports are distributed on the workbench in the circumferential direction, first clamping assemblies used for clamping the rectangular graphite column are arranged on the first rotating assemblies, a pushing and pressing assembly used for pushing the rectangular graphite column downwards is movably arranged on the workbench, and an automatic switching assembly is arranged between the pushing and pressing assembly and the first rotating assemblies; the cutting device has the advantages of stable relative clamping, rotary cutting of a plurality of rectangular graphite columns through one-time operation, intermittent downward pushing, complete and efficient cutting and reliable structure.

A silicon rod manufacturing method, comprising: S1, cutting a round rod (100) in a first direction to obtain a first rough square rod (1) and a plurality of offcut blocks (2), the first direction being the axial direction of the round rod (100); S2, cutting each of the offcut blocks (2) in the first direction to obtain second rough square rods (21); S3, grinding the second rough square rods (21), and bonding and stacking the plurality of ground second rough square rods (21) in a second direction to obtain a second square rod (3), the second direction being orthogonal to the first direction; and S4, cutting the second square rod (3) in the second direction to obtain a plurality of second silicon rods (31). The method saves raw materials, and increases the utilization rate of the round rod (100), thereby improving the production efficiency of finished square rods, and reducing the production cost. The present invention also relates to a silicon rod and a photovoltaic silicon wafer.

The invention belongs to the field of medical titanium alloy material processing, and particularly relates to a preparation method of a high-strength titanium-zirconium alloy wire. The Ti-Zr alloy comprises the following chemical components in percentage by mass: 13.5-16.5% of Zr, less than or equal to 0.10% of Fe, less than or equal to 0.10% of C, less than or equal to 0.015% of H, less than or equal to 0.6% of O, less than or equal to 0.05% of N and the balance of Ti. Firstly, a round bar blank with a certain size is obtained through the procedures of smelting, forging and drawing; and then a finished wire is prepared in the modes of temperature-controlled drawing, stress relief annealing and centerless grinding. By means of the method, the high-strength titanium-zirconium alloy wire with Rm larger than or equal to 950 MPa and A larger than or equal to 10% can be obtained, the problems that the implant material Ti-Zr alloy is low in strength and the like are solved, the high-strength titanium-zirconium alloy wire for dental products can be produced through the method, and qualified raw materials are provided for the dental implant products.

The invention provides a seamless steel pipe for a hollow anchor rod and a strength regulation and control method thereof. Alloy steel round steel is heated and then subjected to hot piercing to be manufactured into a hollow pipe blank; the hollow pipe blank is subjected to spheroidizing annealing treatment and then cooled, and a first treated steel pipe is obtained; wherein the ferrite grain size D1 of the first treated steel pipe is calculated according to a spheroidizing annealing grain size model; the first treated steel pipe is subjected to cold finish rolling forming and cleaned to obtain a second treated steel pipe; the ferrite effective grain size Ddef of the second treatment steel pipe is calculated according to the cold deformation grain refinement model; recrystallizing and annealing the second treated steel pipe to obtain the seamless steel pipe; the ferrite grain size D2 of the seamless steel pipe is calculated according to the recrystallization grain evolution model; the yield strength Rp0.2 of the seamless steel pipe is calculated according to a strength model; reverse design of the yield strength of the seamless steel pipe is achieved, and meanwhile it is guaranteed that the seamless steel pipe has good plasticity.

The utility model discloses an overturning material supporting and receiving device in the technical field of metal round bar processing, which comprises a bearing platform used for bearing a metal round bar, the bearing platform is V-shaped, and the metal round bar can be kept at the central position of the bearing platform; the feeding device is used for feeding the metal round bars to the bearing platform, and before the feeding device is turned over to the position between the center of the bearing platform and the discharging end of the feeding device, so that the metal round bars fed by the feeding device can directly fall to the center position of the v-shaped bearing platform along the feeding device; therefore, the metal round bars are prevented from being stuck by oil stains on the surface of the bearing platform, and the metal round bars cannot roll to a station in the center of the bearing platform.

The utility model provides an air curling accessory and an electric hair drier applying the same, the air curling accessory comprises a curling iron main body, the curling iron main body is in a hollow round bar shape, at least two groups of air outlet arrays are arranged on the curling iron main body at intervals along the axial direction, and each air outlet array comprises at least two air outlet channels which are distributed at intervals along the circumferential direction of the curling iron main body; one axial end of the curling iron main body is a closed end, and the other axial end of the curling iron main body is an air inlet end; the air outlet channel is connected to the outer side face of the curling iron body to form an arc-shaped concave air outlet notch, and an included angle is formed between the tangential direction of the air outlet notch and the highest point of the axis of the curling iron body and the air outlet direction of the air outlet channel. Due to the fact that the air outlet channels of the multiple air outlet arrays integrally formed with the curling iron body form the air outlet notches with certain angles at the wave troughs, the whole structure of the curling iron accessory is simplified, the cost of the curling iron accessory is reduced, and meanwhile the curling effect of hot air output by the curling iron accessory is improved.

The utility model discloses a transfer rack for round bar type workpieces, which comprises a support, a plurality of supporting square tubes are arranged at the top end of the support side by side, a plurality of round bar type workpieces are placed on the supporting square tubes, and the supporting square tubes are obliquely arranged so that the round bar type workpieces can roll downwards along the length direction of the supporting square tubes. The tail end of the supporting square pipe is provided with a material turning mechanism and a base plate, discharging plates are installed on the base plate at intervals, the ends, away from the base plate, of the discharging plates protrude upwards to form clamping hook parts, the material turning mechanism is used for sequentially transferring all round bar type workpieces to the discharging plates, and the discharging plates are obliquely arranged. Therefore, the transferred round bar workpieces roll downwards to the clamping hook parts. According to the material turning mechanism, the hydraulic cylinder, the oil cylinder push block, the material stopping block, the first linkage shaft, the second linkage shaft and the material turning plate of the material turning mechanism are matched with one another, so that each round bar type workpiece is transferred to the discharging plate in sequence, and subsequent transfer of the round bar type workpieces is facilitated.

The utility model discloses an urban rain sewage pipe network pollution discharge point traceability checking device, and particularly relates to the technical field of sewage pipe network pollution discharge point traceability checking, the urban rain sewage pipe network pollution discharge point traceability checking device comprises a sampling mechanism and a connecting mechanism used for urban rain sewage pipe network pollution discharge point traceability checking, the sampling mechanism comprises a sampling block, the sampling block is internally provided with a storage cavity and a detection cavity, and the storage cavity and the detection cavity are communicated with each other. A sewage detection device is arranged in the detection cavity, the connecting mechanism comprises a round block, two symmetrically distributed through holes are formed in the outer walls of the front side and the rear side of the round block, round rods are slidably arranged in the two through holes, racks are fixedly embedded in the sides, close to each other, of the two round rods, and a gear is engaged between the two racks. The two round rods are simultaneously adjusted through the motor, the gear and the two racks, and the rubber blocks on the round rods are firmly abutted against the inner wall of the urban rain sewage pipe network, so that the stability of the whole traceability checking device can be greatly improved, and the checking device can be prevented from being pushed by sewage flow to collide with the inner wall of the urban rain sewage pipe network to be damaged.

The embodiment of the present application provides a forging device for TC4 titanium alloy bars, including a pre-stressing part, a bar rotary feed part, and a forging part. A round bar to be forged is fixed on the bar rotary feed part, and the bar rotary feed part drives the round bar to rotate while feeding it in the direction of the forging part; the pre-stressing part is arranged between the forging part and the bar rotary feed part, and the pre-stressing part includes a pre-stressing support platform, a pre-stressing roller mechanism, and a scraping mechanism. The pre-stressing support platform is arranged below the round bar and supports the round bar; the pre-stressing roller mechanism is arranged above the round bar, and the pre-stressing roller mechanism applies downward pressure to the round bar; the scraping mechanism is arranged on one side of the pre-stressing support platform, and the scraping mechanism rests on the surface of the round bar. The scraping mechanism coats borax on the surface of the round bar while scraping off the oxide layer on the surface of the round bar. The forging device for TC4 titanium alloy bars provided in the embodiment of the present application can remove the oxide layer on the surface of the round bar before forging the round bar, thereby improving the mechanical properties of the round bar.

The invention belongs to the technical field of stainless steel round bar machining, and particularly relates to a bending and cutting device for stainless steel round bar machining, which comprises a machine body, a conveying pipe is fixedly connected to the upper surface of the machine body, the conveying pipe is used for conveying stainless steel round bars, a fixing table is further fixedly connected to the upper surface of the machine body, and a fixing plate is fixedly connected to the upper surface of the fixing table. A first hydraulic cylinder is fixedly connected to the upper surface of the fixing plate, a cut-off tool is arranged at the output end of the first hydraulic cylinder, a positioning disc is fixedly connected to the upper surface of the machine body, two rotating blocks are rotationally connected to the upper surface of the positioning disc, and a processing assembly is arranged on the upper surface of the machine body. The processing assembly comprises a first guide rail arranged on the upper surface of the machine body, two first guide plates are slidably connected into the first guide rail, a fixing frame is fixedly connected to the end of one of the first guide plates, a driving part is arranged in the fixing frame, and by arranging the processing assembly, the problem that burrs on the arc surface of the end of the stainless steel round bar are not cleaned is solved.

The utility model discloses a round bar sample surface polishing device which comprises a base, a centering part and an abrasive belt polishing part used for polishing a round bar sample, the centering part comprises a containing plate, a placing plate, a hollow column, a supporting column, a fixing frame and a pressing plate, and the containing plate is welded to the outer wall of the top of the base through a supporting block; the outer wall of the bottom of the containing plate is fixedly connected with a third electric telescopic rod, the containing plate is fixed to the output end of the third electric telescopic rod through a pin, the hollow column is movably connected to the inner wall of a through hole formed in the containing plate, and a three-jaw chuck is welded to the outer wall of the top of the supporting column. The polishing abrasive belt is in full contact with the circumferential outer wall of the round bar sample, so that polishing dead angles are avoided; the tensioning degree of the polishing abrasive belt can be adjusted, so that the polishing effect is guaranteed; and when the round bar sample needs to be polished, the whole device is covered with the two protective covers, and the safety of the polishing process is guaranteed.

The application provides a rotating ultrasonic detection method for defects in the near surface area of a round bar, and relates to the technical field of material detection. The rotating ultrasonic detection method for defects in the near surface area of a round bar comprises the following steps: selecting a round bar with the same specification as the round bar to be detected as a sample bar, and setting a surface groove and a near-surface transverse hole on the sample bar; emitting ultrasonic waves from an ultrasonic probe to the sample bar to obtain ultrasonic signals corresponding to the surface groove and the near-surface transverse hole; adjusting the parameters of the ultrasonic probe according to the ultrasonic signals, and setting the parameters corresponding to the condition that the amplitudes of the ultrasonic signals corresponding to the surface groove and the near-surface transverse hole are consistent; making the ultrasonic probe scan the round bar to be detected with the set parameters; obtaining the set parameters of the ultrasonic probe corresponding to the condition that the amplitudes of the ultrasonic signals corresponding to the surface groove and the near-surface transverse hole are consistent, so that good scanning signals can be obtained for the surface groove damage and the near-surface transverse hole at the same time during the detection and verification of the near-surface area of the sample bar, the detection reliability is improved, the operation is simple, the success rate is high, and therefore the work efficiency is improved.

The utility model relates to the technical field of steel production, in particular to a sampling and transferring system for steel production. The utility model provides a sampling and transferring system for steel production. The sampling and transferring system comprises a sampling and blanking device and a conveyor, the sampling and discharging device comprises a sampling device and a discharging device; the sampling device is provided with a first station and a second station, the discharging device is provided with a third station and a fourth station, and the conveyor is provided with a fifth station and a sixth station; the second station is adjacent to the third station, and the fourth station is adjacent to the fifth station; when the sampling device is located at the first station, the sampling device is used for receiving steel samples cut off in the cold shearing machine. According to the sampling and transferring system for steel production, manual sampling is not needed, the sampling efficiency is improved, workers can be prevented from being scalded by round bars during sampling, the safety performance is improved, manual carrying and transferring are not needed, and the production efficiency is improved.

The invention discloses a round bar processing equipment multi-parameter cooperative control method based on artificial intelligence, and particularly relates to the field of round bar processing equipment control, which comprises the steps of data acquisition, data processing, data analysis and result judgment. According to data acquisition, a force sensor, a temperature sensor, a displacement sensor and a vibration sensor of specific models are deployed, data are acquired according to different set frequencies of a high-speed cutting process and a common cutting process, abnormal values of the acquired data are eliminated according to the Pauta criterion in data processing, and Kalman filtering denoising and normalization operation are performed. And in the data analysis step, processed data are substituted into a turning and milling cutting force model, an improved Archard tool wear model and a multiple regression machining precision model to be solved, and according to result judgment, the machining quality is evaluated according to a solving result comparison standard, and the equipment state is judged in combination with a threshold value. According to the method, multi-parameter collaborative optimization is realized, the processing quality stability and efficiency are improved, the dependence on artificial experience is reduced, and the downtime is shortened.

The utility model discloses a blanking mechanism suitable for metal round bars of multiple specifications, which belongs to the technical field of metal round bar processing and comprises an end face limiting plate, a material rolling face at the upper end of the end face limiting plate is located above a feeding track and is arranged in an inclined mode towards the feeding track so that the metal round bars can roll towards the feeding track. The material rolling plate is parallel to the end face limiting plate, a fixed material guiding slope and a movable material guiding piece are arranged at the end, close to the feeding rail, of the material rolling plate, and the upper end face of the fixed material guiding slope and the upper end face of the movable material guiding piece both incline towards the feeding rail; the movable material guiding piece can slide on the material rolling plate so as to adjust the width value of the included angle space.

The invention discloses a hot press forming feeding device and a hot press forming mechanism. The hot press forming feeding device includes a mounting seat, a mobile feeding mechanism, a feeding cylinder, a discharge seat, etc. The discharge seat has a discharge position with a side opening, and the discharge position is connected to the feeding mechanism to realize automatic feeding of the workpiece; the mobile feeding mechanism is installed with a transfer cylinder, and the transfer cylinder is connected with an air clamp for clamping the workpiece from the discharge seat. The hot press forming mechanism includes a press, a heating feeding module, a robot, etc. The heating feeding module includes a feeding mechanism, a high-frequency heating device, and a feeding device. In this way, the automatic loading, heating, feeding, stamping and other operations of round bar workpieces such as watch strap buckles can be automatically completed. The whole process has less manual intervention, high production efficiency, less labor, high equipment integration, less space occupied, and lower cost. At the same time, the feeding device has a simple structure, and the loading process of round bar workpieces is efficient, orderly, reliable and practical.

The utility model relates to the technical field of water softening, and provides a water distributor assembly, a tank body assembly and water softening equipment. The water distributor assembly comprises a disc body and a filter screen, the periphery of the disc body is suitable for abutting against the inner wall of the tank body assembly, the disc body comprises a plurality of vertical ribs and a plurality of round ribs, the round ribs are distributed in a concentric circle mode, the vertical ribs are connected between any two adjacent round ribs, and the distance between any two adjacent round ribs is gradually increased in the radial outward direction of the round ribs; the filter screen covers the disc body. According to the water distributor assembly provided by the utility model, the plurality of vertical ribs and the plurality of round ribs are arranged, the plurality of round ribs are distributed in a concentric circle manner, the vertical rib is connected between any two adjacent round ribs, and the distance between any two adjacent round ribs is gradually increased in the radial outward direction of the round ribs. In the radial outward direction of the disc body, the water flow passing through the disc body is larger and larger, so that the water flow is in full contact with the resin, and the resin utilization rate is increased.

The invention provides a forging method of an eccentric crankshaft, which comprises the following steps of: stamping a round bar-shaped blank to divide the round bar-shaped blank into a first part, a second part and a third part along the axial direction; the circular section of the round bar type blank in the radial direction is evenly divided into n fan-shaped parts with the central angle being theta in the circumferential direction, theta is larger than or equal to 30 degrees and smaller than or equal to 60 degrees, and 360 degrees are divided by theta to be an integer; the second part is placed on the lower V-shaped anvil, and the to-be-machined structures at different positions are rotated to the position below the upper flat anvil through the clamping piece; an upper flat anvil is used for carrying out pressing-down machining on the to-be-machined structure located on the lower portion so that the second part can be machined into an eccentric part, the extension length of the upper flat anvil in the radial direction of the second part is L, the chord length corresponding to each fan-shaped part is L1, the chord length corresponding to every two adjacent fan-shaped parts is L2, and L is larger than or equal to L1 and smaller than or equal to L2; and drawing out and finishing the first part and the third part. According to the scheme, the machining efficiency of the eccentric part can be improved.

The invention discloses welding equipment and method for spiral stirrup machining, and relates to the technical field of spiral stirrup welding. The welding equipment comprises a conveying module for conveying a main reinforcement structure and a positioning module for positioning and fixing the main reinforcement structure; the main reinforcement structure is defined by a plurality of groups of main reinforcement steel bars which are arranged in a circumferential array; the conveying module is used for conveying the main reinforcement structure towards the sleeving end used for sleeving the spiral stirrup and the welding end used for welding the spiral stirrup and the main reinforcement steel bar. A sleeving module is arranged at the sleeving end and is used for spirally sleeving the plain round steel bars on the main reinforcement structure to form spiral stirrups; a welding manipulator is arranged at the welding end and is used for fixing the spiral stirrup and the main reinforcement in a spot welding manner; in addition, the spiral stirrup does not need to be preprocessed, the spiral stirrup can be directly bent and formed on the main reinforcement structure, and the forming efficiency of the reinforcement cage structure is further improved.

The invention relates to the field of materials and processes for automobile parts, in particular to a homogenization evaluation method for hardenability of Ti-containing carburizing steel and application. According to different specifications and different looseness and segregation levels of the round steel, sampling regulation is carried out on the center part and the center part of the section of the Ti-containing carburizing steel round steel, and the hardenability and the hardenability bandwidth of the carburizing steel can be more truly reflected. When the hardness of the tail end hardenability sample is detected, two surfaces equidistant from the circle center of the section of the round steel are detected, a telecentric surface far away from the circle center of the section of the round steel and a proximal surface close to the circle center of the section of the round steel are detected, and compared with the current national standard, the detection result is more scientific and accurate. The method can be applied to almost all carburized steel bars with large component fluctuation, the uniformity is truly reflected, technicians can select raw materials with proper hardenability bandwidth to be applied to shaft gear parts with different size characteristics and using performance requirements, and the application prospect is very wide.

The present invention discloses a new energy vehicle frame inner hole grinding machine, which relates to the technical field of grinding equipment, including a machine body, a support frame fixedly connected to the top of the machine body near the left edge, a base fixedly connected to the bottom of the machine body, a workbench fixedly connected to the top center of the machine body, a round bar rotatably connected to the bottom center of the flat plate, the top of the round bar is fixedly connected to the output end of the servo motor through a coupling, a strip groove is provided at the bottom of the outer surface of the round bar, a grinding point is fixedly connected to the position of the bottom of the outer surface of the round bar near the strip groove, a fan blade is fixedly connected to the center of the outer surface of the round bar, the output end of the cylinder is fixedly connected to a cover shell, a press tooth is hinged on the side surface of the cover shell near the bottom, and an auxiliary module is arranged at the center of the side surface of the cover shell. The new energy vehicle frame inner hole grinding machine achieves the effect of rapid chip removal, can handle waste chips in time, reduce the impact of waste chips, and the inner hole is not easy to be scratched.

The invention discloses a device and method for testing durability of a concrete structure in a deep complex environment, and the method is characterized in that a self-anchoring loading device enables two concrete members and a high-strength round bar to be pressed and fixed through bolts, so that the two concrete members are in a high-stress loading environment; the pressure sensor is used for measuring stress applied to the concrete member by the bolt; the self-anchoring loading device is placed in a high-strength pressure tank containing a corrosive solution, and the stray current recorder is used for enabling the two concrete members to be in a stray current environment; the air compressor is communicated with the high-strength pressure tank and is used for pressurizing the corrosive solution, so that the two concrete members are in a high-water-pressure environment; on the premise that erosion durability tests can be carried out on a plurality of samples at the same time, the environment where a deep concrete structure is located can be simulated through the coupling effect of high stress, stray current and high water pressure, and therefore the durability of the concrete structure in the deep complex environment can be accurately obtained.

The present invention provides a production method for small-diameter thick-wall titanium alloy seamless tubes, comprising: Step 1: obtaining a titanium alloy ingot through three times of VAR melting; Step 2: blooming, drawing out, and radial forging the titanium alloy ingot into a round bar, and machining the round bar into a hollow tube blank through deep hole drilling, internal honing, and external turning; Step 3: performing three passes of cold rolling on the hollow tube blank to produce a finished titanium alloy seamless tube; sampling the titanium alloy tube after each pass of cold rolling, observing its crack defects, removing the crack defects, and performing intermediate vacuum annealing after removing the crack defects; Step 4: performing vacuum annealing, straightening, pickling, ultrasonic testing, and packaging on the titanium alloy finished tube in Step 3 to produce a small-diameter thick-wall titanium alloy seamless tube. The present invention comprehensively formulates measures from aspects such as tube blank specification design, tube blank processing technology, titanium alloy tube cold rolling process design, vacuum annealing process design, and internal and external surface defect treatment technology of the tube blank to solve the problem of internal surface cracks in cold rolling of small-diameter thick-wall titanium alloy seamless tubes.

The invention provides a niobium rod for an Nb3Sn superconducting wire niobium material and a preparation method of the niobium rod, and the preparation method of the niobium rod comprises the following steps: a, upsetting and drawing forging: carrying out n times of upsetting and drawing forging on a niobium cast ingot, n is any integer in 2-5, and carrying out annealing heat treatment in a gap between two times of upsetting and drawing forging or after the last upsetting and drawing forging, the upsetting and drawing forged round bar is obtained; b, radial forging is conducted, specifically, the upsetting and drawing forging round bar is subjected to radial forging; and c, rotary forging: carrying out rotary forging on the rod blank subjected to radial forging. The niobium rod prepared by the method meets one or more of the following items: the grain size is 7-8 grades, the elongation at break is greater than or equal to 40%, and the hardness (HV / 2.9 N) is greater than or equal to 40 and less than or equal to 65. Namely, the niobium rod prepared by the preparation method has at least one of the characteristics of uniform and fine grains, low hardness and high plasticity, and the comprehensive performance of the niobium rod is improved, so that the strict requirements of the Nb3Sn superconducting wire on the base material in high-field magnet application are met.

To provide a method of counting the number of round bars allowing for correctly counting the number of round bars irrespectively of the position of a rest surface.SOLUTION: A method of counting the number of round bars includes: acquiring height data in an upper-half outer periphery of a plurality of round bars arrayed at a constant interval in an array direction; taking a highest position of obtained height data as a reference position and identifying a position where height becomes minimal or minimum respectively on positive and negative sides in the array direction within a predetermined range determined from a diameter of the round bar with reference to the reference position as a boundary; adding a range from a negative minimal or minimum position over to a positive minimal or minimum position through the reference position, as an existence range of one round bar, to the number of round bars; taking a highest position of remaining height data excepting height data present in the existence range of the one round bar as a next reference position and identifying a position where the height becomes minimal or minimum on positive and negative sides respectively in the array direction within a predetermined range determined from the diameter of the round bar with reference to the next reference position as a boundary; and adding the same as a next existence range of a round bar to the number of round bars into calculation of the number of round bars.SELECTED DRAWING: Figure 3